A jocular comparison of a dead patient's mouth open and with the tongue sticking out, reminiscent of the letter Q. We rushed through the wards of injured soldiers, skipping over anyone wearing the Q-sign.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.